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首页> 外文期刊>Heat Transfer Engineering >Effect of Surface Tension Variation of the Working Fluid on the Performance of a Closed Loop Pulsating Heat Pipe
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Effect of Surface Tension Variation of the Working Fluid on the Performance of a Closed Loop Pulsating Heat Pipe

机译：工作流体的表面张力变化对闭环脉动热管性能的影响

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摘要

In this article, the effect of surface tension variation of the working fluid on the thermal performance of a pulsating heat pipe (PHP) is presented. A two-turn closed loop PHP is fabricated with a combination of copper and quartz tubes having 2 mm inner diameter. Three filling ratios are considered in the present study. A common surfactant namely sodium dodecyl sulfate is used to vary the surface tension of the distilled water which is the base working fluid tested in the PHP. Visualization as well as heat transfer studies is performed in the PHP. Thermal resistances of working fluids with different surface tension are estimated for each filling ratio. Further, the effect of surfactant concentration on the hydrodynamics of the PHP is also discussed. Addition of surfactant induces formation of foam after the filling process and in some phase of PHP operation. It changes the flow regime boundaries and lowers the evaporator temperature under specific operating conditions. A flow regime map is also constructed for the present PHP. The working fluid with a lower surface tension gives a minimum evaporator temperature in the vertical orientation and thus, lowest thermal resistance has been obtained. However, surface tension does not influence the performance in the horizontal position appreciably.
机译：在本文中，介绍了工作流体的表面张力变化对脉冲热管（PHP）的热性能的影响。两匝闭环PHP由内径为2 mm的铜管和石英管组合而成。在本研究中考虑了三种填充率。常用的表面活性剂即十二烷基硫酸钠用于改变蒸馏水的表面张力，该蒸馏水是PHP中测试的基础工作流体。在PHP中进行可视化以及传热研究。对于每个填充率，估计具有不同表面张力的工作流体的热阻。此外，还讨论了表面活性剂浓度对PHP流体力学的影响。表面活性剂的添加会导致在填充过程之后以及PHP操作的某些阶段产生泡沫。在特定的操作条件下，它会改变流态边界并降低蒸发器温度。还为当前PHP构建了流态图。具有较低表面张力的工作流体在垂直方向上给出了最低的蒸发器温度，因此，获得了最低的热阻。但是，表面张力不会明显影响水平位置的性能。

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  • 来源
    《Heat Transfer Engineering》 |2019年第8期|509-523|共15页
  • 作者

    Kumar Manoj; Kant Ravi; Das Arup Kumar; Das Prasanta Kumar;

  • 作者单位

    Indian Inst Technol Kharagpur, Dept Mech Engn, Kharagpur 721302, W Bengal, India;

    Indian Inst Technol Kharagpur, Dept Mech Engn, Kharagpur 721302, W Bengal, India;

    Indian Inst Technol Roorkee, Dept Mech & Ind Engn, Roorkee, Uttar Pradesh, India;

    Indian Inst Technol Kharagpur, Dept Mech Engn, Kharagpur 721302, W Bengal, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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